Question

A metal after combustion gain 32% mass, calculate the equivalent mass of metal

Answer 1

Let atomic mass of metal is M and valency of metal is x.

so, chemical formula of metal oxide = M2Ox

% by weight of oxygen = 32%

so, mass of oxygen/mass of metal oxide × 100 = 32

or, (16 × x)/(M × 2 + 16 × x) × 100 = 32

or, 16x/(2M + 16x) = 8/25

or, 400x = 16M + 128x

or, 272x = 16M

or, M/x = 272/16 = 57

so, equivalent mass of metal = M/x = 57